Free Biomolecules (Daily Quiz: 13) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Question-1

A coenzyme is

(a) One that shares the function of other enzyme

(b) Same enzyme that occurs in different tissues such as heart and muscle

(c) Organic or inorganic in nature and helps activate metabolic enzymes

(d) Organic non-protein in nature and helps to activate metabolic enzymes

Question-2

The two polynucleotide chains in DNA are

(a) discontinuous

(b) parallel

(c) antiparallel

(d) semiconservative

Question-3

The curve given below shows enzymatic activity with relation to three conditions (pH, temperature and substrate concentration) What do the two axes (X and Y) represent?

X-axis	Y-axis
(a) Temperature	Enzyme activity
(b) Substrate concentration	Enzymatic activity
(c) Enzymatic activity	Temperature
(d) Enzymatic activity	pH

(a) (a)

(b) (b)

(c) (c)

(d) (d)

Question-4

Which of the following statements regarding enzyme inhibition is correct?

(a) Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme

(b) Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein

(c) Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate

(d) Non-competitive inhibitors often bind to the enzyme irreversibly

Question-5

The "lock and key" model of enzyme action illustrates that a particular enzyme molecule

(a) Interacts with a specific type of substrate molecule

(b) May be destroyed and resynthesized several times

(c) Reacts at identical rates under all conditions

(d) Forms a permanent enzyme-substrate complex